Sander



May 6, 1 c. D. TRUSSELL SANDER 2 SHEETS -SHEET 1 Filed May 4, 1950 May6, 1952 c. D. TRUSSELL SANDER 2 SHEETS-SHEET 2 Filed May 4, 1950 QINTOR.

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Patented May 6, 1952 UNITED STATES FATEN'E @FFE'CE 8 Claims.

1 The invention herein disclosedrelates to what are generally known assanders, and is a continuation-in-part of application for patent-SerialI'-Io.27 ,869,filed May 19, 194%,and now abandoned.

Particular objects of the invention are to provide means for holdingsandpaper-or other rubbingmaterial in a convenient form for rubbing,smoothing, polishingand the like; and in a shape to-be readily graspedand heldinthe hands and of-- such construction that the sandpaper, emerycloth or other rubbing material may be quickly and easily placed inposition-for use or be removed for replacement by fresh material'ormaterial of a different grain or character.

Particularly it is a purposeofthe invention'to provide-a holder whichwill-have no parts protruding'beyond the sandpapen so that the devicemay be used to reach fully into'corners'and limited spaces.

Another important object of the invention is to provide the sandpaper orother-covering material in a prepared form, ready to be applied andto-closely fit the holder without-preliminary folding or other timeconsuming, troublesome operations.

In this connection it is a further purpose of the'invention to providethe sandpaper or other such material in a prefolded, flat condition,ready to be opened up and applied to the holder, and in such shape thatthe ends or the paper will project beyond the block or grip portion ofthe holder to prevent slivers or the like entering between the paper andthe holder.

Further important objects of the invention are to effect automatic,secure locking in place of the sandpaper on the holder and at the sametime to provide for quick, easy release and removal of the sandpaper.

A further important object of the invention is to provide an'easyoperating trigger construction for effecting'the quick release of thesandpaper from the holder.

Special objects of the invention also are to provide a device having thecharacteristics outlined which will be of simple construction and lowcost.

Other desirable objects attained, as well as the novel featuresconstituting the invention, are set forth or will appear in the courseof the following specification.

The drawings accompanying and forming part of the specificationillustrate certain present preferred embodiments of the invention.Structure, however, may be further modified and changed,

all within the true intent-and scope'of the invention ashereinaftr'defined and claimed.

Fig. 1 in the drawings is a perspective view of one of the sanders;

Fig. 2 is a longitudinal sectional view of the same showing the holdingbar fully lifted to clear the sandpaper, the end of the bar indicated asbroken away;

Fig. 3 is an end view of the device showing the spring holding bar inthe upstanding position clear of the sandpaper and withdotted-linesindicating howthe bar will be compressed to apply springtension to the securing of the paper as it is lowered in theholding-groove;

Fig. 4 is a longitudinal sectional View of 'the device showing the barfullylowered in holding position;

Fig. 5 isan end view ofthe device with the bar in this position;

Fig. 6 is a broken away and part sectional side elevation of a modifiedform of the device having the block orbody of the holder m-adeupof apiece offolded sheet metal;

Fig. '7 is an end elevation of the latter;

Fig. 8 15-2. plan view-of a sheetof abrasive material showing how it maybe lined toaccurately fold-into closed gripping engagement about theholder block; 1

Fig. 9 is a broken perspective view showing. how the lined-rubbingmaterial may becollapsed on the 'foldin'glines into a compactbundlefor-shipument purposes;

Fig. 10 is'a longitudinal sectional viewof a modified formof'theinvention: with the holding bar downin securing position;

Fig. 11 is a similar view showing the Lt'rigger operated totrip andrelease the holdingbar;

Fig. 12 is a View looking at the trigger 'endof the device;

Fig. 13 is an enlarged cross sectional vie-was Fig. 14 is a view of theopposite or hinge end of the device;

Fig. 15 is an end elevation showing a modified form of the tubularblock.

In principle the invention comprises a block or base about which thesandpaper or other material is rolled, having a longitudinal groove.into which the ends of thematerial are tucked and held-by a clampingbar.

The block or'body of the holder is designated 1 I, and While shown insquare cross section, may be of other desired angular 'or curvilinearsection.

For practical reasons this holding .blocktmay be in the nature of a barof wood or'otherimaterial,--of a length and cross section 'to'zbe con- 1veniently gripped and held. intone: or hofthhands.

The groove i2 is shown extending full length down the center of one sideof the block and the sandpaper H3 or other material used, as havinginfolded flaps I l, I5, tucked in over opposite side walls of the grooveand held so by the spring clamping bar IS.

The clamping bar is shown made up of a single strip of springy sheetmetal doubled to provide a rounded handle H at one end and having at theopposite free ends angularly extended lugs l8 pivotally engaged on thepivot pin or stud l9. These pivot lugs may be integral or attachedportions of the spring clamping bar and they are shown in Fig. asinwardly ofiset toward each other at 20 to allow the doubled spring barto expand to its widest extent as shown in full lines, Figs. 2 and 3,when the bar is opened up, fully clear of the groove in the block.

In this fully expanded condition the sides of the folded strip willfrictionally grip the infolded edges of the sandpaper as soon as the baris pivoted inward into the slot. And this gripping pressure willincrease as the bar is lowered fully into position within the groove, asin Figs. 1, 4 and 5.

The groove i2 is shown extended angularly at 2| at the hinge end of theblock to freely receive the offset hinge lugs [8 of the clamp bar. Inthe fully seated position the bar may rest on the bottom of the grooveas in Figs. 4 and 5, wholly below the surface of the block and hence innon-interfering position.

To prevent the bar interfering in any way with free use of the device,the bar is preferably made of a length less or no greater than thelength of the block, substantially as indicated in Fig. 4. And undersuch circumstances to provide access to the end of the bar, for raisingit from its holding position, the end of the block may be recessed asindicated at 22, providing for engagement of a finger beneath therounded handle forming end I! of the bar.

The block may be made all in one piece or, as indicated in Figs. 1 and2, in two complemental portions suitably secured together as by means ofdowels, pins, nails, screws or other through fastenings 23.

An advantage of this two-part construction is that relatively narrowstrips of molding may be used, rabbeted at one corner so that twocompanion lengths of the molding may be put together with the rabbetedportions in face-to-face relation to complementally form the clampinggroove l2.

The holding block may be made of wood, be molded in plastic or beotherwise formed. Wood is economical and provides desired weight andsolidity.

The block also may be made of sheet material folded to shape, such asmetal, very heavy cardboard or the like.

Figs. 6 and '7 illustrate a form of the block made up of sheet metal 24folded to square cross sectional tubular form, except at the side forthe groove where the free edges of the sheet material are turned inwardat 25 to leave a full length open-ended groove for the clamp bar IS.

The inturned edge portions 25 of the folded sheet metal are shownextended at 26 at one end to provide lugs for the hinge pin z'l-whichlatter, as shown in Fig. '7, may be in the form ofa long rivet extendingbetween opposite sides to hold the folded structure in its square crosssectional form.

The inturned portions 25, of the sheet. metal are further shown ashaving angularly "turned shown as wi flanges 28, 29, projecting from onesuch portion toward the other, as appears in Fig. '7, to serve asspacers holding the groove forming side walls of the structure apartwhen this tubular form of block is riveted or otherwise secured in itssquared-up form.

To facilitate the application of the sandpaper and the close folding ofit about the block, it is preferred to have the sandpaper or othermaterial in sheets, as shown in Fig. 8, of a proper size to accuratelyfit the block, and to score it or crease it on lines 30 near oppositeedges to define the inwardly folding securing flaps I4, l5,

' and to score or crease it on intermediate lines such as 3|, to fit thecorners of the block.

These pre-lined sheets may be shipped flat or, in some instances, theymay be folded on the lines 30, 3|, as indicated in Fig. 9, to form anarrow, fiat, compact bundle suitable for shipping or possibly carryingin the pocket or the like.

A special feature of the invention is the making of the sandpapercovering longer than the block and the infolding of the extended ends asindicated at 32, to provide doubled, reinforced edges beyond the ends ofthe block which will prevent the paper from slipping under slivers orsplinters and being torn thereby. This double reinforcement of theexposed ends of the sandpaper also saves Wear and tear on the ends ofthe block and generally provides a more stable, useful form of article.

To provide for these end folds, the blank shown in Fig. 8 is illustratedas having score lines 33 where the ends are to be folded back to providethe double thickness.

The forming of the blank with score fold lines, in addition to savingtime and trouble in locating and closely fitting the sandpaper about theblock, saves breaking and tearing of the sandpaper which, particularlyin the heavier grades, frequently follows when a piece of sandpaper isbent to form a folding line, and such bending usually results inirregular, non-straight lines which would cause the sandpaper to fitloosely or unevenly and in places bulge away from the block.

In the modified form of the invention shown in Figs. 10 to 14, theholding bar is of V-shaped cross section so as to wedge in place overthe inturned edges of the sandpaper and automatically lock in thatposition by reason of the spring expansive force of the V cross section.

This expansive spring channel form of bar is designated 35.

In practice the locking of this bar is so effective and firm thatdifficulty may be experienced in releasing it. Accordingly, there isprovided what has been termed a trigger, in the form of a trip lever 3%pivoted mid-length at 3? beneath the bar, at the end of the slotopposite the hinge, said trigger engageable at its opposite end with theher and having a thumb press portion 33 at its outer end. To accommodatethe rockin action of ("is trigger, the bar receiving slot I2 is en-edand deepened at 39 sufficiently for free operating clearance of thetrigger or trip lever.

In both forms of the invention illustrated the trigger is shown as Llshaped in cross section.

In the embodiment, in which the clamping bar made up of sprin separated,substan- ...'ily i. Hie} bars, the trigger is mounted with the U-shapedcross section inverted and the inner crowned end of the triggerarrangedto engage the lower edges of the parallel spaced bars,

the trigger is arranged with'the hollow or concave side of the sameuppermost, as shown in Fig. 13, to engage beneath the-center of the V-shapedclamping bar, as particularly shown in .In both instances theopening trigger provides a quick acting means for immediately releasingand lifting the clamping bar from its seated, sandpaper holding relationin the holder.

To avoid sharp edges on the clamp bar which might cut into the handapplying pressure to the block, these edges may be rolled inward asindicated at 4B in Figs. 12, 13 and 14, and these pressure applying orhearing edges aiso serve as stiffening flanges reinforcing the sheetmetal bar.

Fig. 15 illustrates the hand grip block 4| made in the hollow form butall in one continuous, unbroken piece, extruded or injection molded inplastic material. This material has advantages over wood or metal and inthe extruded or injection molded form may be less expensive.

What is claimed is:

l. A sander of the character disclosed comprising a block having agroove to receive the ends of a sheet of rubbing material Wrapped aboutthe block and a clamp bar engageable in said groove over the inturnedends of the rubbing material,

. said bar comprising a strip doubled on itself intermediate its endsand having angularly extended lugs at one end of the same pivoted in theblock at a point to oiiset the bar from the adjoining end of the blockwhen the bar is swung outwardly clear of holding engagement in thegroove, said folded strip tensioned to spread apart and the pivot lugsbeing inwardly offset toward each other to permit the side portions ofthe folded strip to fully separate when the bar is swung open, offsetfrom the end of the block.

2. A sander of the character disclosed comprising a block having agroove to receive the ends of a sheet of rubbing material wrapped aboutthe block and a clamp bar engageable in said groove over the inturnedends of the rubbing material, said bar having angularly extended lugs atone end pivoted in the block at a point to offset the bar from theadjoining end of the block when the bar is swung outwardly clear ofholding engagement in the groove, said block being of hollow tubularform, made up of sheet material rolled into the form of a tubular blockwith the ends of the same turned inward to provide the groove and saidinturned ends having angularly projected edge flanges holding theinturned ends spaced apart in groove forming relation and the pivot forthe bar consisting of a pin extending through opposite sides of thesheet material forming the block and through the pivot lugs on the endof the bar and holding the inturned ends together to the extentdetermined by said angularly projected edge flanges.

3. A sander oi the character described comprising in combination, ablock having a groove to receive the ends of a sheet of rubbing materialwrapped around the block and a clamp bar engageable in said groove overthe inturned ends of the rubbing material, said bar having angularlyextended lugs at one end pivoted in the block at a point to offset thebar from the adjoining end 01" the block when the bar is swung outwardlyclear of holding engagement in the groove, said block being of hollowtubular form. made up of sheet material rolled into the form of atubular block with the ends of the same turned inwardly to provide thegroove andsaid inturned ends having angularly projected edge flangesholding the inturned ends spaced apart in groove forming relation and apin extending through opposite sides of the sheet material forming theblock and through the pivot lugs on the'end of the bar and holding theinturned ends together to the extent determined by said angularlyprojecting flanges, said sheet of rubbing material having parallel foldlines impressed therein to match the angles of said block, andsaid sheetbeing folded on said fold lines as impressed around said block forconforming to the general shape thereof.

"4. A sander comprising a handgrip block having a longitudinal groove inone side, a sheet of sandpaper wrapped about the block and havingpreformed fold lines near opposite ends of the same defining securingflange portions at the ends of the sheet to be tucked into said grooveand a clamp bar engageable in the groove over said tucked-in end flangeportions of the sandpaper, said block being of angular cross section andsaid sheet of sandpaper having other preformed fold lines matching thecorners of said angular block and fold lines at right angles theretonear those edges of the sheet which will be at the ends of the block fordoubling over said edges at the ends of the block and said sheet beingenough longer than the block for said doubled over edges to project outbeyond the ends of the block into position for abutting engagement withthe ends of the block and covering the lines of demarcation between thesides of the block and the surrounding sheet.

5. A sander of the character disclosed, comprising a block having agroove to receive the infolded ends of a sheet of rubbing materialwrapped about the block, a clamp bar engageable in said groove over theinturned ends of the rubbing material, and a, finger actuated triggerpivoted in said groove beneath said clamp bar in position to lift theclamp bar out of its seated relation in said groove, said pivotedtrigger having a projecting finger hold exposed at one end of the block.

6. A sander of the character disclosed, comprising a block having agroove to receive the infolded ends of a sheet of rubbing materialwrapped about the block, a clamp bar engageable in said groove over theinturned ends of the rubbing material, and a finger actuated triggermounted in the block in position to lift the clamp bar out of its seatedrelation in said groove, said clamp bar being pivotally mounted at oneend in the block and said trigger being a finger lever pivotally mountedin the other end of the block beneath the free end of said pivoted clampbar.

7. A sander of the character disclosed, comprising a block having agroove to receive the infolded ends of a sheet of rubbing materialwrapped about the block, a clamp bar engageable in said groove over theinturned ends of the rubbing material, and a finger actuated triggermounted in the block in position to lift the clamp bar out of its seatedrelation in said groove,

said clamp bar being pivotally mounted at one end in the block and saidtrigger being a finger lever pivotally mounted in the other end of theblock beneath the free end of said pivoted clamp bar, said clamp barbeing of V-shaped cross secltion and said trigger lever being ofU-shaped pross section engageable beneath the edge of said 8. A sandercomprising a hand grip block having a longitudinal groove in one side, asheet of sandpaper wrapped about the block, said sheet having preformedfold lines in opposite ends of the same defining end flanges positionedto tuck into said groove when the sheet is folded about the block, saidsheet in its wrapped position about the block projecting beyond one endof the block and having the projecting portions of the same foldedinward over the end of the block to cover space between the sides of theblock and the overlying sandpaper and in position for abuttingengagement with the adjoining end of the block and a clamp bar yieldablyengaged in said groove over said tucked-in end portions of thesandpaper.

CLARENCE D. TRUSSELL.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 449,930 Dubey Apr. 7, 18911,635,350 Simons July 12, 1927 1,656,981 Lewis Jan. 24, 1928 1,844,996Walker Feb. 16, 1932 2,403,434 Gulden July 9, 1946 2,457,045 KittermanDec. 21, 1948 2,464,950 Smith Mar. 22, 1949

